Update README.md

Author: zxdong262

README.md

@@ -21,6 +21,7 @@ gradlew build
 
 # would show something like
 # server running at http://127.0.0.1:7837
+# Then you can use http://127.0.0.1:7837/api/sync as API Url in electerm custom sync
 
 # in electerm sync settings, set custom sync server with:
 # server url: http://127.0.0.1:7837